[Sigzy]

What are the issues with RK’s? I actually ordered some and will be coming back from them this week.

[mike@x-ph.com]

Originally Posted by Sigzy

What are the issues with RK’s? I actually ordered some and will be coming back from them this week.

im not aware of any issues

[Sigzy]

Originally Posted by mike@x-ph.com

im not aware of any issues

Had me sweating for a minute LOL

[mike@x-ph.com]

Originally Posted by Sigzy

Had me sweating for a minute LOL

[Cartman417209]

Originally Posted by mike@x-ph.com

There is a history of back and forth on the forums, but honestly, most, if not all, of them were N54, so from a long time ago.

I dont think there have been any issues on this platform

I just spent the last few hours searching Vargas turbos and there’s been a few failures and broken wheels in the civic and supra community 🤷🏼*♂️

[SE7EN335]

Originally Posted by SwankPeRFection

Hate to hijack this, but how did you like them? They seemed like the perfect fit for what I was looking for, but now they’re gone. Did they ever say why they discontinued them? Maybe they didn’t sell well? ��*♂️

I like them and they suit my needs. They are only a tiny bit laggier than stock around 200-300rpm laggier and with a lot more mid range and top end. They didnt give me any explanation. Just that they are discontinuing them. I assume that they didnt sell well and they seem to have discontinued all their BMW products

[SwankPeRFection]

Originally Posted by SE7EN335

I like them and they suit my needs. They are only a tiny bit laggier than stock around 200-300rpm laggier and with a lot more mid range and top end. They didnt give me any explanation. Just that they are discontinuing them. I assume that they didnt sell well and they seem to have discontinued all their BMW products

Dang, I was really looking forward to these because they seemed like what I wanted out of a balanced setup on the car.

[mikewho_G82]

Originally Posted by papaman1234

Hey guys, what is the best upgraded turbo for the M3? I’m thinking about going Vargas or RK auto works. Either them good?

are you looking for upgraded twins or conversion to a single turbo?

this may give you insight to meet your goals with the right parts

check out this- https://www.bendcalibration.com/blog/s58-build-path

[Sigzy]

Figured I would keep you all up to date!

I also have an Instagram that has updated pictures etc with the build coming along

Instagram: M3_Sigs

DME from ship to receiving back in hand was 6.5 days via DHL. I received the rest of my exhaust and upgraded turbos today and everything is scheduled to get put on this upcoming Monday.

[Sigzy]

Update:

Should Have Dyno numbers either today or tomorrow and have the car back in my possession by Friday then will proceed to get some draggy times this weekend if the weather permits pretty excited and thank you to everyone who has been following the thread

[markoz28]

Originally Posted by Sigzy

Update:

Should Have Dyno numbers either today or tomorrow and have the car back in my possession by Friday then will proceed to get some draggy times this weekend if the weather permits pretty excited and thank you to everyone who has been following the thread

I may have missed it but can you share you build details?

[Sigzy]

Originally Posted by markoz28

I may have missed it but can you share you build details?

Schedule: 9/10/24 - Full stage 2 build starts
• Stage 2 Hybrid Turbos @rkautowerks
• Catless Downpipes @masteryofartanddesign
• Valvetronic full equal length system @valvetronic
• Top mount Intakes @burger_tuning
• XHP Trans tune @xhpflashtool
• Ported Manifold @mishimoto
• ID 1050 injectors @injectordynamics
• LPFP Upgrade @precision_motorsports
• 91 octane and E85 MHD+ Custom Tune

[Sigzy]

Ran into some issues today - Turbos are only wanting to push 33-35 psi on 100 %wastegste. Currently have VTT inlet pipes and going to pull them off tomorrow to see if we are getting restrictions. Per RK sight these are capable of 40+psi. We are at 85% E and putting down 784awhp 680 torque. Hopefully we can get this issue straightened out tomorrow and get these pushing 40psi for more favorable numbers.

[Commanderwiggin]

Originally Posted by Sigzy

Ran into some issues today - Turbos are only wanting to push 33-35 psi on 100 %wastegste. Currently have VTT inlet pipes and going to pull them off tomorrow to see if we are getting restrictions. Per RK sight these are capable of 40+psi. We are at 85% E and putting down 784awhp 680 torque. Hopefully we can get this issue straightened out tomorrow and get these pushing 40psi for more favorable numbers.

Normal for these turbos I hear; take the intakes completely off and they'll breath but that's a horrible idea. Mosselman, Pures, LM900 don't have this issue.

[papaman1234]

Originally Posted by Sigzy

Ran into some issues today - Turbos are only wanting to push 33-35 psi on 100 %wastegste. Currently have VTT inlet pipes and going to pull them off tomorrow to see if we are getting restrictions. Per RK sight these are capable of 40+psi. We are at 85% E and putting down 784awhp 680 torque. Hopefully we can get this issue straightened out tomorrow and get these pushing 40psi for more favorable numbers.

1. Who’s your tuner?
2. I heard rk turbos are not good on that car. I recommend gc+ or pure for hybrid.

[Sigzy]

Originally Posted by papaman1234

1. Who’s your tuner?
2. I heard rk turbos are not good on that car. I recommend gc+ or pure for hybrid.

1. Brian may ( ratified Motorsports)

2. I reached out to RK directly and was told they flow 900-1000hp. So far we are not finding that. Today the inlets are being removed (aftermarket VTT) if still won’t go past 33-35 psi at 100% waste gate than it’s a turbo issue at that point.

If they do flow more without the inlets it’s a matter of modification which I’m not a fan of ( I like turn key stuff)

I slept like 3 hours last night wrapping my head around it lol still couldn’t. Super frustrating but need to get the final verdict. No doubt in my mind a set of LM or pures this car shakes 850-880awhp.

[Sigzy]

Originally Posted by Commanderwiggin

Normal for these turbos I hear; take the intakes completely off and they'll breath but that's a horrible idea. Mosselman, Pures, LM900 don't have this issue.

To clarify do mean my inlets or intakes?

[SwankPeRFection]

Might wanna check that Valvetronic. The restriction could also very well be past the turbos if you can’t evacuate the gasses quickly enough. Disconnect after the downpipes and see where you’re at there too to rule everything out.

[Commanderwiggin]

Originally Posted by Sigzy

To clarify do mean my inlets or intakes?

Both, can't run that way daily but remove both to do your own test to verify.

[Sigzy]

Originally Posted by SwankPeRFection

Might wanna check that Valvetronic. The restriction could also very well be past the turbos if you can’t evacuate the gasses quickly enough. Disconnect after the downpipes and see where you’re at there too to rule everything out.

Currently on 3.5” catless dp and valves are 100 percent open.

[SwankPeRFection]

Originally Posted by Sigzy

Currently on 3.5” catless dp and valves are 100 percent open.

That’s not what I said. Don’t care if the valves are open. Sometimes exhaust flow build can affect back pressure. Only way to truly rule it out is to disconnect it. Hell, even a bad downpipe bellhousing design can cause issues with boost onset and even full turbine speed, but generally for our designs, there’s not much you can fuck up on that.

On some Valvetronic exhausts their second pipe that comes into the main one comes in at a 90° T into the main exhaust. This is generally a bad design the closer you are to the engine because the two flows collide and both can back up rather than flow out. There’s also literally no “collector” type setup where this happens so that doesn’t help matters much either. If you’re at the point of intakes being taken off to narrow down the issue to the turbos being it, you might as well spend the 10 min to take the midpipe down for a run as well. At that point you’ll also have additional ammo to throw at RK in regards to their hardware being the issue.

Also, don’t forget the obvious… boost leak between turbos and engine, but I’d think your tuner would have checked this first before anything else.

[Sigzy]

Originally Posted by SwankPeRFection

That’s not what I said. Don’t care if the valves are open. Sometimes exhaust flow build can affect back pressure. Only way to truly rule it out is to disconnect it. Hell, even a bad downpipe bellhousing design can cause issues with boost onset and even full turbine speed, but generally for our designs, there’s not much you can fuck up on that.

On some Valvetronic exhausts their second pipe that come into the main one comes in at a 90° T into the main exhaust. This is generally a bad design the closer you are to the engine because the two flow collide and both can back up rather than flow out. There’s also literally no “collector” type setup where this happens so that doesn’t help matters much either. If you’re at the point of intakes being taken off to narrow down the issue to the turbos being it, you might as well spend the 10 min to take the midpipe down for a run as well. At that point you’ll also have additional ammo to throw at RK in regards to their hardware being the issue.

I will forward this information to the shop, thanks for the insight! Not sure how to go about the issue if it does in fact narrow it down to hardware, website states 40+psi and 900whp capability yet we are hard stuck at 33-35. Will continue to update. Also to make note I have VTT inlet pipes and a ported inlet already.